''Graneledone yamana'' is a species of

octopus An octopus (: octopuses or octopodes) is a soft-bodied, eight-limbed mollusc of the order Octopoda (, ). The order consists of some 300 species and is grouped within the class Cephalopoda with squids, cuttlefish, and nautiloids. Like oth ...

in the genus ''

Graneledone ''Graneledone'' is a genus of octopuses in the family Octopodidae The Octopodidae comprise the family containing the majority of known octopus species (about 175 species). Genera The World Register of Marine Species lists these 23 genera: *'' ...

''.

Description

''G. yamana'' is assigned to this genus because of the absence of an

ink sac An ink sac is an anatomical feature that is found in many cephalopod mollusks used to produce the defensive cephalopod ink. With the exception of nocturnal and very deep water cephalopods, all Coleoidea (squid, octopus and cuttlefish) which dwell ...

and

crop A crop is a plant that can be grown and harvested extensively for profit or subsistence. In other words, a crop is a plant or plant product that is grown for a specific purpose such as food, Fiber, fibre, or fuel. When plants of the same spe ...

, the presence of cartilaginous warts covering the body cavity, uniserial suckers on the

arms Arms or ARMS may refer to: *Arm or arms, the upper limbs of the body Arm, Arms, or ARMS may also refer to: People * Ida A. T. Arms (1856–1931), American missionary-educator, temperance leader Coat of arms or weapons *Armaments or weapons **Fi ...

, and a reduced

radula The radula (; : radulae or radulas) is an anatomical structure used by mollusks for feeding, sometimes compared to a tongue. It is a minutely toothed, chitinous ribbon, which is typically used for scraping or cutting food before the food enters ...

. Its identifying characteristics are papillose skin, two horns located above the eyes, small gills, and five to seven lamellae located on the outside of the demibranch. The arms of ''G. yamana'' have 35–80 suckers on the females and 26–70 on the males. ''G. yamana'' physically resembles the species '' Graneledone verrucosa'', except the cartilaginous warts on the body cavities of both these species differ. ''G. verruscosa'' is also found in the

North Atlantic Ocean The Atlantic Ocean is the second largest of the world's five oceanic divisions, with an area of about . It covers approximately 17% of Earth's surface and about 24% of its water surface area. During the Age of Discovery, it was known for se ...

instead of the South.

Distribution

This species is known from the southwest Atlantic Ocean off the coasts of

Uruguay Uruguay, officially the Oriental Republic of Uruguay, is a country in South America. It shares borders with Argentina to its west and southwest and Brazil to its north and northeast, while bordering the Río de la Plata to the south and the A ...

Argentina Argentina, officially the Argentine Republic, is a country in the southern half of South America. It covers an area of , making it the List of South American countries by area, second-largest country in South America after Brazil, the fourt ...

, and southern

Brazil Brazil, officially the Federative Republic of Brazil, is the largest country in South America. It is the world's List of countries and dependencies by area, fifth-largest country by area and the List of countries and dependencies by population ...

. ''G. yamana'' is the fifth species of ''Graneledone'' found in the southern oceans.Kommritz J. G. 2000. A new species of ''Graneledone'' (Cephalopoda:Octopodidae) from the Southweat Atlantic Ocean. J.Mollus.Stud.66(4):5 43-549. This genus has been found in the deep waters near

hydrothermal vent Hydrothermal vents are fissures on the seabed from which geothermally heated water discharges. They are commonly found near volcanically active places, areas where tectonic plates are moving apart at mid-ocean ridges, ocean basins, and hot ...

References

* Kommritz J. G. 2000. A new species of ''Graneledone'' (Cephalopoda:Octopodidae) from the southwest Atlantic Ocean. J.Mollus.Stud.66(4):5 43-549. * Allcock A.L., Collins M.A., and Vecchione M. 2003. A redescription of ''Graneledone verrucosa'' (Verrill, 1881) (Octopoda:Octopodidae). J.Mollus. Stud. 69(2):135-143. Octopodidae Cephalopods described in 2000 {{octopus-stub